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Finding the Fourth Proportional to 420,349.33, 630,860.24 and 220,787.40

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Solution

The fourth proportional to 420,349.33, 630,860.24 and 220,787.40 is: 331,357.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,349.33 : 630,860.24 = 220,787.40 : x
  2. Step 2: Convert to fraction form
    420,349.33/630,860.24 = 220,787.40/x
  3. Step 3: Cross multiply
    420,349.33x = 630,860.24 × 220,787.40
  4. Step 4: Simplify right side
    420,349.33x = 139,285,995,070.67
  5. Step 5: Solve for x
    x = 139,285,995,070.67/420,349.33
  6. Step 6: Final answer
    x = 331,357.72

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.